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233e7676 LC |
1 | ;;; GNU Guix --- Functional package management for GNU |
2 | ;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org> | |
e49951eb | 3 | ;;; Copyright © 2013 Mark H Weaver <mhw@netris.org> |
073c34d7 | 4 | ;;; |
233e7676 | 5 | ;;; This file is part of GNU Guix. |
073c34d7 | 6 | ;;; |
233e7676 | 7 | ;;; GNU Guix is free software; you can redistribute it and/or modify it |
073c34d7 LC |
8 | ;;; under the terms of the GNU General Public License as published by |
9 | ;;; the Free Software Foundation; either version 3 of the License, or (at | |
10 | ;;; your option) any later version. | |
11 | ;;; | |
233e7676 | 12 | ;;; GNU Guix is distributed in the hope that it will be useful, but |
073c34d7 LC |
13 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | ;;; GNU General Public License for more details. | |
16 | ;;; | |
17 | ;;; You should have received a copy of the GNU General Public License | |
233e7676 | 18 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. |
073c34d7 LC |
19 | |
20 | (define-module (guix ui) | |
21 | #:use-module (guix utils) | |
22 | #:use-module (guix store) | |
cdd5d6f9 | 23 | #:use-module (guix config) |
073c34d7 | 24 | #:use-module (guix packages) |
299112d3 LC |
25 | #:use-module ((guix licenses) #:select (license? license-name)) |
26 | #:use-module (srfi srfi-1) | |
27 | #:use-module (srfi srfi-11) | |
073c34d7 LC |
28 | #:use-module (srfi srfi-26) |
29 | #:use-module (srfi srfi-34) | |
64fc89b6 | 30 | #:use-module (ice-9 match) |
073c34d7 LC |
31 | #:export (_ |
32 | N_ | |
33 | leave | |
cdd5d6f9 | 34 | show-version-and-exit |
3441e164 | 35 | show-bug-report-information |
073c34d7 | 36 | call-with-error-handling |
64fc89b6 | 37 | with-error-handling |
299112d3 | 38 | location->string |
c61b026e LC |
39 | call-with-temporary-output-file |
40 | switch-symlinks | |
299112d3 LC |
41 | fill-paragraph |
42 | string->recutils | |
e49951eb MW |
43 | package->recutils |
44 | run-guix-command | |
45 | guix-main)) | |
073c34d7 LC |
46 | |
47 | ;;; Commentary: | |
48 | ;;; | |
49 | ;;; User interface facilities for command-line tools. | |
50 | ;;; | |
51 | ;;; Code: | |
52 | ||
53 | (define %gettext-domain | |
54 | "guix") | |
55 | ||
56 | (define _ (cut gettext <> %gettext-domain)) | |
57 | (define N_ (cut ngettext <> <> <> %gettext-domain)) | |
58 | ||
473b03b3 LC |
59 | (define (install-locale) |
60 | "Install the current locale settings." | |
61 | (catch 'system-error | |
62 | (lambda _ | |
63 | (setlocale LC_ALL "")) | |
64 | (lambda args | |
65 | (format (current-error-port) | |
66 | (_ "warning: failed to install locale: ~a~%") | |
67 | (strerror (system-error-errno args)))))) | |
68 | ||
e49951eb | 69 | (define (initialize-guix) |
633f045f | 70 | "Perform the usual initialization for stand-alone Guix commands." |
e49951eb MW |
71 | (install-locale) |
72 | (textdomain "guix") | |
73 | (setvbuf (current-output-port) _IOLBF) | |
74 | (setvbuf (current-error-port) _IOLBF)) | |
75 | ||
073c34d7 LC |
76 | (define-syntax-rule (leave fmt args ...) |
77 | "Format FMT and ARGS to the error port and exit." | |
78 | (begin | |
79 | (format (current-error-port) fmt args ...) | |
80 | (exit 1))) | |
81 | ||
cdd5d6f9 LC |
82 | (define* (show-version-and-exit #:optional (command (car (command-line)))) |
83 | "Display version information for COMMAND and `(exit 0)'." | |
84 | (simple-format #t "~a (~a) ~a~%" | |
85 | command %guix-package-name %guix-version) | |
86 | (exit 0)) | |
87 | ||
3441e164 LC |
88 | (define (show-bug-report-information) |
89 | (format #t (_ " | |
90 | Report bugs to: ~a.") %guix-bug-report-address) | |
91 | (format #t (_ " | |
92 | ~a home page: <~a>") %guix-package-name %guix-home-page-url) | |
93 | (display (_ " | |
94 | General help using GNU software: <http://www.gnu.org/gethelp/>")) | |
95 | (newline)) | |
96 | ||
073c34d7 LC |
97 | (define (call-with-error-handling thunk) |
98 | "Call THUNK within a user-friendly error handler." | |
99 | (guard (c ((package-input-error? c) | |
100 | (let* ((package (package-error-package c)) | |
101 | (input (package-error-invalid-input c)) | |
102 | (location (package-location package)) | |
103 | (file (location-file location)) | |
104 | (line (location-line location)) | |
105 | (column (location-column location))) | |
106 | (leave (_ "~a:~a:~a: error: package `~a' has an invalid input: ~s~%") | |
107 | file line column | |
108 | (package-full-name package) input))) | |
109 | ((nix-protocol-error? c) | |
110 | ;; FIXME: Server-provided error messages aren't i18n'd. | |
111 | (leave (_ "error: build failed: ~a~%") | |
112 | (nix-protocol-error-message c)))) | |
113 | (thunk))) | |
114 | ||
115 | (define-syntax with-error-handling | |
116 | (syntax-rules () | |
117 | "Run BODY within a user-friendly error condition handler." | |
118 | ((_ body ...) | |
119 | (call-with-error-handling | |
120 | (lambda () | |
121 | body ...))))) | |
122 | ||
64fc89b6 LC |
123 | (define (location->string loc) |
124 | "Return a human-friendly, GNU-standard representation of LOC." | |
125 | (match loc | |
126 | (#f (_ "<unknown location>")) | |
127 | (($ <location> file line column) | |
128 | (format #f "~a:~a:~a" file line column)))) | |
129 | ||
c61b026e LC |
130 | (define (call-with-temporary-output-file proc) |
131 | "Call PROC with a name of a temporary file and open output port to that | |
132 | file; close the file and delete it when leaving the dynamic extent of this | |
133 | call." | |
134 | (let* ((template (string-copy "guix-file.XXXXXX")) | |
135 | (out (mkstemp! template))) | |
136 | (dynamic-wind | |
137 | (lambda () | |
138 | #t) | |
139 | (lambda () | |
140 | (proc template out)) | |
141 | (lambda () | |
142 | (false-if-exception (close out)) | |
143 | (false-if-exception (delete-file template)))))) | |
144 | ||
145 | (define (switch-symlinks link target) | |
146 | "Atomically switch LINK, a symbolic link, to point to TARGET. Works | |
147 | both when LINK already exists and when it does not." | |
148 | (let ((pivot (string-append link ".new"))) | |
149 | (symlink target pivot) | |
150 | (rename-file pivot link))) | |
151 | ||
299112d3 LC |
152 | (define* (fill-paragraph str width #:optional (column 0)) |
153 | "Fill STR such that each line contains at most WIDTH characters, assuming | |
154 | that the first character is at COLUMN. | |
155 | ||
156 | When STR contains a single line break surrounded by other characters, it is | |
157 | converted to a space; sequences of more than one line break are preserved." | |
158 | (define (maybe-break chr result) | |
159 | (match result | |
160 | ((column newlines chars) | |
161 | (case chr | |
162 | ((#\newline) | |
163 | `(,column ,(+ 1 newlines) ,chars)) | |
164 | (else | |
165 | (let ((chars (case newlines | |
166 | ((0) chars) | |
167 | ((1) (cons #\space chars)) | |
168 | (else | |
169 | (append (make-list newlines #\newline) chars)))) | |
170 | (column (case newlines | |
171 | ((0) column) | |
172 | ((1) (+ 1 column)) | |
173 | (else 0)))) | |
174 | (let ((chars (cons chr chars)) | |
175 | (column (+ 1 column))) | |
176 | (if (> column width) | |
177 | (let*-values (((before after) | |
178 | (break (cut eqv? #\space <>) chars)) | |
179 | ((len) | |
180 | (length before))) | |
181 | (if (<= len width) | |
182 | `(,len | |
183 | 0 | |
184 | ,(if (null? after) | |
185 | before | |
186 | (append before (cons #\newline (cdr after))))) | |
187 | `(,column 0 ,chars))) ; unbreakable | |
188 | `(,column 0 ,chars))))))))) | |
189 | ||
190 | (match (string-fold maybe-break | |
191 | `(,column 0 ()) | |
192 | str) | |
193 | ((_ _ chars) | |
194 | (list->string (reverse chars))))) | |
195 | ||
196 | (define (string->recutils str) | |
197 | "Return a version of STR where newlines have been replaced by newlines | |
198 | followed by \"+ \", which makes for a valid multi-line field value in the | |
199 | `recutils' syntax." | |
200 | (list->string | |
201 | (string-fold-right (lambda (chr result) | |
202 | (if (eqv? chr #\newline) | |
203 | (cons* chr #\+ #\space result) | |
204 | (cons chr result))) | |
205 | '() | |
206 | str))) | |
207 | ||
208 | (define* (package->recutils p port | |
209 | #:optional (width (or (and=> (getenv "WIDTH") | |
210 | string->number) | |
211 | 80))) | |
212 | "Write to PORT a `recutils' record of package P, arranging to fit within | |
213 | WIDTH columns." | |
214 | (define (description->recutils str) | |
215 | (let ((str (_ str))) | |
216 | (string->recutils | |
217 | (fill-paragraph str width | |
218 | (string-length "description: "))))) | |
219 | ||
220 | ;; Note: Don't i18n field names so that people can post-process it. | |
221 | (format port "name: ~a~%" (package-name p)) | |
222 | (format port "version: ~a~%" (package-version p)) | |
223 | (format port "location: ~a~%" | |
224 | (or (and=> (package-location p) location->string) | |
225 | (_ "unknown"))) | |
226 | (format port "home-page: ~a~%" (package-home-page p)) | |
227 | (format port "license: ~a~%" | |
228 | (match (package-license p) | |
229 | (((? license? licenses) ...) | |
230 | (string-join (map license-name licenses) | |
231 | ", ")) | |
232 | ((? license? license) | |
233 | (license-name license)) | |
234 | (x | |
235 | (_ "unknown")))) | |
236 | (format port "synopsis: ~a~%" | |
237 | (string-map (match-lambda | |
238 | (#\newline #\space) | |
239 | (chr chr)) | |
240 | (or (and=> (package-synopsis p) _) | |
241 | ""))) | |
242 | (format port "description: ~a~%" | |
243 | (and=> (package-description p) description->recutils)) | |
244 | (newline port)) | |
245 | ||
e49951eb MW |
246 | (define (show-guix-usage) |
247 | ;; TODO: Dynamically generate a summary of available commands. | |
248 | (format (current-error-port) | |
249 | (_ "Usage: guix COMMAND ARGS...~%"))) | |
250 | ||
251 | (define (run-guix-command command . args) | |
252 | ;; TODO: Gracefully report errors | |
253 | (let* ((module (resolve-interface `(guix scripts ,command))) | |
254 | (command-main (module-ref module | |
255 | (symbol-append 'guix- command)))) | |
256 | (apply command-main args))) | |
257 | ||
258 | (define (guix-main arg0 . args) | |
259 | (initialize-guix) | |
260 | (let () | |
261 | (define (option? str) (string-prefix? "-" str)) | |
262 | (match args | |
263 | (() (show-guix-usage) (exit 1)) | |
264 | (("--help") (show-guix-usage)) | |
265 | (("--version") (show-version-and-exit "guix")) | |
266 | (((? option? arg1) args ...) (show-guix-usage) (exit 1)) | |
267 | ((command args ...) | |
268 | (apply run-guix-command | |
269 | (string->symbol command) | |
270 | args))))) | |
271 | ||
073c34d7 | 272 | ;;; ui.scm ends here |